US7048488B1 - Apparatus for transferring wafer and ring - Google Patents
Apparatus for transferring wafer and ring Download PDFInfo
- Publication number
- US7048488B1 US7048488B1 US10/009,851 US985101A US7048488B1 US 7048488 B1 US7048488 B1 US 7048488B1 US 985101 A US985101 A US 985101A US 7048488 B1 US7048488 B1 US 7048488B1
- Authority
- US
- United States
- Prior art keywords
- wafer
- ring
- thermal treatment
- chamber
- treatment chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/68—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for positioning, orientation or alignment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67784—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations using air tracks
Definitions
- the present invention relates to a method of transferring a wafer between a thermal treatment chamber and a thermal treatment installation.
- U.S. Pat. No. 5,162,047 discloses a thermal treatment installation which comprises a thermal treatment chamber, a “wafer boat”/rings assembly, a loading device and a transport device.
- the loading device serves to place wafers in and to remove wafers from the assembly
- the transport device serves to place the assembly in and remove the assembly from the thermal treatment chamber.
- the assembly consists of a frame to which a large number of rings are joined equally spaced, with their flat sides positioned above one another.
- the rings are each provided with a recess, which is not specified in more detail, in the inner edge, on which a wafer can be placed by the loading device.
- the assembly After loading a large number of wafers, the assembly is moved by the transport device to the thermal treatment chamber to subject all wafers, located on the recesses, simultaneously to a treatment in which a heat treatment takes place.
- plastic deformation of the wafer can occur.
- silicon at temperatures higher than 900–1000° C. the mechanical strength of the wafer decreases substantially and plastic deformation can occur more easily than at room temperature.
- the deformation of silicon wafers occurs because crystal planes can shift over one another under the influence of stresses present or generated in the material. This is known by the term “slip”. This slip can lead to warping of the wafer such that this is detectable with the naked eye.
- thermal stresses there is a temperature gradient over the wafer which leads to a non-uniform expansion of the wafer with corresponding mechanical stresses, also referred to as thermal stresses.
- This temperature gradient over the wafer occurs in particular on introducing it into a reactor and removing it therefrom.
- the temperature in the reactor will be appreciable, for example 900–1000° C., in order to achieve an adequate throughput time. If the ambient temperature is room temperature, on introduction of the wafer into or removal of the wafer from the reactor a substantial temperature gradient will be produced, with the resultant stresses. After all, the thermal capacity is relatively low because of the limited thickness and the large radiating surface of the wafer.
- connection between the rings and the frame gives rise to an additional difference in thermal capacity in the rings which, as a result of the positioning of the connection, can lead to local deviation of the temperature in the ring and the wafer, as a result of which mechanical stresses can also be produced locally in the wafer during heating/cooling. Local adverse deformation of the wafer can occur as a result.
- treatment is not carried out on a large number of wafers at the same time, as in U.S. Pat. No. 5,162,047, but, for reasons specific to the treatment process, only one wafer is treated at a time.
- thermal treatment installations in which only a single wafer is treated per thermal treatment it is customary according to the prior art to place the wafer in, or remove the wafer from, the thermal treatment chamber individually, that is to say directly with the aid of a transport mechanism and without an auxiliary support such as, for example, a wafer ring.
- the present invention relates in particular to contact-free treatment of a wafer.
- the wafer in a reactor is supported uniformly over the entire surface by a gas stream, so that no gravitational stresses can arise during the treatment.
- the top section and bottom section of the reactor, between which the wafer is accommodated can be heated very uniformly so that no temperature gradient of any significance is produced over the wafer during the treatment.
- the wafer is picked up by a cold gripper for introduction and removal, high local temperature gradients are produced close to the support points and slip occurs.
- an appreciable temperature gradient is produced over the wafer as a whole.
- This gradient has two components: a linear and a radial component.
- the linear component arises because the wafer is withdrawn from between the two hot reactor bodies (top section and bottom section) in a linear movement.
- the radial component arises because the edge of the wafer is able to radiate its heat over a wider angle than the mid section of the wafer.
- the radial gradient in particular leads to harmful stresses.
- the aim of the present invention is further to restrict or completely to preclude the slip in a wafer during transport into and out of the thermal treatment chamber and in particular during the contact-free treatment.
- An aspect of the present invention involves a method of transferring wafers into and out of a thermal treatment chamber in a thermal treatment installation.
- the treatment chamber has a top section and a bottom section between which the wafer is accommodated during treatment.
- the thermal treatment installation 100 has a loading chamber 120 in which one wafer 6 of a set of wafers is combined with a ring 1 in a wafer/ring combination.
- the loading chamber 120 has loading means for placing the wafer 6 on a wafer support 1 and transport means for moving the wafer/ring combination.
- the wafer 6 is placed on the wafer support 1 with the loading means while in the loading chamber 120 , wherein the wafer support 1 is configured as a ring having support elements to support the wafer 6 .
- the wafer support 1 loaded with the wafer 6 is inserted into the thermal treatment chamber 110 of the reactor 10 using the transport means so that the wafer 6 and the wafer support 1 are positioned between the top section and the bottom section in the thermal treatment chamber 110 .
- the wafer 6 is individually processed in the thermal treatment chamber 110 .
- the wafer support 1 is removed from the thermal treatment chamber 110 .
- the rings according to the invention can, of course, be handled by any robot known from the prior art.
- the invention also relates to a thermal treatment installation/ring combination, wherein said thermal treatment installation comprises a treatment chamber delimited by two sections located opposite one another, wherein at least one of said sections is provided with a gas supply for floating positioning of a wafer between said sections, wherein said ring is designed to be placed between said sections, wherein in the operating position the distance between said two sections at the location of said ring essentially corresponds to the thickness of said ring and wherein at least three radial gas passages are arranged between said ring and the section concerned.
- a gas stream will move towards the wafer both from the bottom and from the top of the reactor chamber in order to position said wafer accurately between the top section and bottom section of the reactor.
- a ring which is provided with outflow openings for said gas can be arranged around the wafer. It has been found that if the wafer moves towards a particular edge of the ring the outflow opening located in that position will be closed off to some extent, as a result of which a rise in the pressure of the gas occurs between the ring and the related edge, as a result of which the ring is pushed back towards the centre again. This is promoted in that the other openings allow more gas through, as a result of which a lowering in pressure occurs at these locations.
- auxiliary element equipped with support pins which extend through grooves or openings made in the reactor walls or in the top or bottom of the ring as described above, the ring and the wafer bearing on said support pins during movement.
- said auxiliary element is likewise annular.
- the support pins are provided with internal channels which at one end open onto the contact surface with the wafer and at the other end are in communication with an internal channel in the auxiliary ring, which channel is connected to vacuum means in order to produce a vacuum in the channels.
- the invention also relates to a thermal wafer treatment installation/ring combination
- a thermal wafer treatment installation/ring combination comprising a thermal wafer treatment installation having at least one receptacle for wafers, wherein said receptacle is constructed to receive a ring in such a way that the ring is removable and wherein each ring is designed to accommodate and support a wafer therein.
- FIG. 1 shows a perspective view of a first embodiment of the ring according to the invention with a wafer removed therefrom;
- FIG. 2 shows, diagrammatically, in cross-section, the ring according to FIG. 1 with wafer during introduction into a reactor;
- FIG. 3 shows, diagrammatically, the ring with wafer according to FIG. 2 during the treatment in the reactor;
- FIGS. 4 a–c show, in cross-section, various variants of the ring according to the invention.
- FIGS. 5 a,b show further variants provided with heating means
- FIG. 6 shows a plan view of a further embodiment of the ring according to the invention.
- FIG. 7 shows a side view of the ring with wafer according to FIG. 6 ;
- FIG. 8 shows a variant of FIGS. 6 and 7 with auxiliary ring
- FIG. 9 shows a side view of a construction according to FIG. 8 introduced into a reactor
- FIG. 10 shows a variant of FIGS. 6 and 7 with auxiliary ring
- FIG. 11 shows a side view of a construction according to FIG. 8 introduced into a reactor.
- FIG. 12 shows a plan view of a thermal treatment installation, according to preferred embodiments of the invention.
- FIG. 1 A first embodiment of the ring according to the invention is shown in perspective in FIG. 1 and is indicated in its entirety by 1.
- This ring consists of a somewhat thicker outer edge 2 and a thinner inner edge 3 .
- Three support pins 4 are provided.
- the ring 2 is provided with a handling portion 5 for fixing to some sort of handling robot.
- a wafer is indicated by 6 .
- the external diameter of the wafer 6 is somewhat smaller than the internal diameter of inner edge 3 , such that the wafer 6 bears on the support points 4 during transport thereof.
- Ring 1 is intended for such transport, as can be seen from FIG. 2 .
- This figure shows the introduction of the wafer 6 into a reactor 10 consisting of a top section 11 and a bottom section 12 which are heated in some manner known from the prior art. During introduction the wafer bears on the support pins 4 .
- gas streams 13 and 14 are activated, as a result of which the wafer conies away from the support pins 4 and starts to float and can be treated ( FIG. 3 ). After treatment the gas streams 13 and 14 are switched off and the wafer returns to the support pins 4 and is removed from the reactor.
- the high heat gradient which is produced over the wafer is essentially compensated for by the presence of the ring 1 . After all, as a result of the relatively high thermal capacity of the ring, more rapid cooling at the edge of the wafer than in the centre thereof will be prevented.
- the cooling characteristics or heating characteristics of the wafer during transport can be controlled by the selection of the material and control of the wall thickness of the ring and the distance between the edge of the wafer and inner edge 3 .
- the outer edge 2 of the ring 1 is made somewhat thicker. By this means mechanical strength is provided and the thermal capacity increases.
- the differences between inner edge 2 and outer edge 3 can comprise any construction conceivable in the state of the art. A few examples are given in FIGS. 4 a–c.
- heating elements 16 can be fitted, as is shown in FIG. 5 .
- the material of the ring will consist of a material that transmits radiation, such as quartz material. Consequently the distance from the heating element 16 to the inner ring 3 does not constitute a problem.
- the characteristics of the ring in respect of the transmission of radiation are less important because the heating element is closer to the wafer.
- FIG. 6 shows a plan view of a further variant of the ring according to the invention.
- This ring is indicated in its entirety by 21 .
- the support pins are indicated by 24 .
- radial gas passages are present, which are indicated by 22 .
- these passages are grooves.
- FIG. 7 shows the various features in cross-section during operation. It can be seen that gas stream 14 which holds the wafer in the middle between the top section 11 and the bottom section 12 is deflected and moves away in the radial direction over the wafer. However, the gases are only able to escape from the environment of the wafer through the grooves 22 . As a result of using the ring the x-y position of the wafer is accurately determined. After all, if the wafer 6 moves towards one of the grooves 22 the somewhat obstructing effect of the wafer will mean that less gas can be discharged at that location. As a result the pressure rises at that location and the wafer will move back.
- FIG. 8 A variant is shown in FIG. 8 , the ring 31 shown in this figure not being provided with support points.
- a further ring 41 is arranged around ring 31 and this ring is provided with support pins 34 which extend through the gas discharge grooves 32 which have been made in the bottom section 12 of the reactor.
- FIG. 9 shows a cross-section of this variant, introduced into a reactor.
- FIG. 10 A variant is shown in FIG. 10 , the ring 31 in this figure not being provided with support points.
- a further ring 51 is arranged around ring 31 and this ring is provided with support pins 54 which extend through the gas discharge grooves 32 which have been made in the bottom section 12 of the reactor.
- the support pins 54 are provided with internal channels 56 which at one end open onto the contact surface 57 with the wafer and at the other end are in communication with an internal channel in the auxiliary ring 51 , which is connected via communication passage 55 to vacuum means (not shown) in order to produce a vacuum in the channels.
- FIG. 11 shows a cross-section of this variant, introduced into a reactor.
- the top and bottom section of the reactor that is to say sections 11 and 12
- the top and bottom section of the reactor can be produced in a particularly simple manner.
- radial positioning is achieved with the aid of the ring 21 , 31 .
- the boundary surface of the top section 11 and bottom section 12 with the reactor chamber can be essentially flat, a few grooves having been milled therein.
Abstract
Description
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1012004A NL1012004C2 (en) | 1999-05-07 | 1999-05-07 | Method for moving wafers as well as ring. |
PCT/NL2000/000297 WO2000068977A1 (en) | 1999-05-07 | 2000-05-08 | Method for transferring wafers and ring |
Publications (1)
Publication Number | Publication Date |
---|---|
US7048488B1 true US7048488B1 (en) | 2006-05-23 |
Family
ID=19769156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/009,851 Expired - Lifetime US7048488B1 (en) | 1999-05-07 | 2000-05-08 | Apparatus for transferring wafer and ring |
Country Status (10)
Country | Link |
---|---|
US (1) | US7048488B1 (en) |
EP (1) | EP1177571B1 (en) |
JP (1) | JP4632551B2 (en) |
KR (1) | KR100667718B1 (en) |
CN (1) | CN1157761C (en) |
AU (1) | AU4626000A (en) |
DE (1) | DE60030968T2 (en) |
NL (1) | NL1012004C2 (en) |
TW (1) | TW452840B (en) |
WO (1) | WO2000068977A1 (en) |
Cited By (27)
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US20060004493A1 (en) * | 2004-06-30 | 2006-01-05 | Jack Hwang | Use of active temperature control to provide emmisivity independent wafer temperature |
US20060186031A1 (en) * | 2005-02-22 | 2006-08-24 | Baldwin Filters, Inc. | Filter apparatus |
US20060286807A1 (en) * | 2005-06-16 | 2006-12-21 | Jack Hwang | Use of active temperature control to provide emmisivity independent wafer temperature |
US20070160947A1 (en) * | 2006-01-06 | 2007-07-12 | Tokyo Electron Limited | Heating device and heating method |
US20080245719A1 (en) * | 2005-02-22 | 2008-10-09 | Baldwin Filters, Inc. | Filter Element And Filter Assembly Including Locking Mechanism |
US20090308801A1 (en) * | 2008-06-16 | 2009-12-17 | Baldwin Filters, Inc. | Fluid Filter, Fluid Filter Assembly, And Mounting Method |
US20090308803A1 (en) * | 2008-06-16 | 2009-12-17 | Baldwin Filters, Inc. | Filter With Water Separation Device |
US20090308802A1 (en) * | 2008-06-16 | 2009-12-17 | Baldwin Filters, Inc. | Filter With Ejection Mechanism |
US20110097491A1 (en) * | 2009-10-27 | 2011-04-28 | Levy David H | Conveyance system including opposed fluid distribution manifolds |
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CN102569142A (en) * | 2012-02-03 | 2012-07-11 | 上海宏力半导体制造有限公司 | Silicon chip transfer apparatus, transfer support ring, and semiconductor technology reaction equipment |
US8991619B2 (en) | 2012-03-26 | 2015-03-31 | Baldwin Filters, Inc. | Filter assembly with water evacuation and methods |
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US9808744B2 (en) | 2013-01-04 | 2017-11-07 | Baldwin Filters, Inc. | Three-part end cap and filter element including same |
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US20210125853A1 (en) * | 2019-10-24 | 2021-04-29 | Asm Ip Holding B.V. | Susceptor for semiconductor substrate processing |
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US11610803B2 (en) | 2020-10-20 | 2023-03-21 | Changxin Memory Technologies, Inc. | Mounting fixture of bearing ring for wafer |
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Also Published As
Publication number | Publication date |
---|---|
KR100667718B1 (en) | 2007-01-15 |
JP4632551B2 (en) | 2011-02-16 |
AU4626000A (en) | 2000-11-21 |
CN1157761C (en) | 2004-07-14 |
CN1349656A (en) | 2002-05-15 |
KR20010112476A (en) | 2001-12-20 |
WO2000068977A1 (en) | 2000-11-16 |
EP1177571B1 (en) | 2006-09-27 |
JP2002544664A (en) | 2002-12-24 |
TW452840B (en) | 2001-09-01 |
DE60030968D1 (en) | 2006-11-09 |
EP1177571A1 (en) | 2002-02-06 |
NL1012004C2 (en) | 2000-11-13 |
DE60030968T2 (en) | 2007-05-03 |
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